2003 Mazda6 loss of power when accelerating

Have a exhaust shop check out your catalytic converter. As it ages it starts to crumble internally and clog it self up. If it is not taken care of it can blow down stream and fill the muffler or burn valves under the excess heat and strain.

MY friend the problem for your car is the coils, I have a Mazda 6 2004, and it was a mistake buy this car, I have that problem at 45,000miles, And I change the 6 coils 2 times, I recommend check the pressure of the each coil. AND so sorry you just star with the nightmare of Mazda 6.

I had the same problem and I took it to the shop and they said my cat was bad ( it was making noises) and my fuel pump went bad (twice now). I only have 39,000 miles on mine and I baby it. POS 2004 Mazda 6 V6.

Coil pack. I have a 2003 Mazda 6 two years ago, during a difficult year, I burned out my fuel pump from runnin out of gas so much. a couple weeks leading up to its dramatic demise, it would do ths exact same loss of power thing. seemingly random at first then more and more until I finally had to get a new fuel pump. Problem solved? Temporarily, For a couple months. then it started again (completely randomly too) for 3-10min at a time. then weeks went by of nothing, but then it started happening EVERY TIME AFTER 5-10MIN OF DRIVING. Mechanic discovered I needed a new coil pack $190 for the part. And I have never had that problem since (7months ago). Im not sure if that dieing fuel pump kickstarted it all but the coil pack replacement resolved it.

I had loss of power with my Mazda Demio. Turned out it was the high tension wires leading to the spark plugs, the rubber was split causing the electricity to short circuit. Wrapping it with electrical tape solved the problem until the wires could be replaced.

I have Mazda6 after running long distance it doesn't want to start,?

I have had this problem at about 150000km mine had a break in one of the cables going from the coil to the bougie

What is that when your car is not picking up speed and sounds like air coming out of your motor,I have a 2007 madza6

Same year and model and doing the exact same thing. I checked the coil I thought was bad,after testingvit was ,car ran like a dream for a total of 7 min. I'm waiting on a whole set to come in,if 1 is bad the others follow rite behind,best to do all at once. Hope this helps